This is a 4″ external gravity flap terminal, with long spigot for easy fixing.

The T4MF (ref) is an exterior fitted wall ventilator; it is used in conjunction with 4 inch (100mm) ducting. The gravity flaps installed on this vent helps diminish back draughts and has been set behind the framework to reduce clacking in
crosswinds.

It has an elongated spigot to ease with attaching the ducting onto the vent. The screw mountings are hidden
behind the flaps which keeps this product as aesthetically pleasing as possible.

External gravity flap terminals
Pack Size: 20

Datasheet (T4MF)